ECAT Chemistry Chemical Equilibrium Test Online

1. Temperature for preparation of SO₃ is

2. When sparingly soluble salt is in equilibrium with molar concentration of its oppositely charged ion when the product is called

3. Chemical equilibrium is referred to as dynamic because, at equilibrium, the

4. The equilibrium will shift towards right by increasing ___________ of reactants

5. Kc > Products / Reactants favours

6. In an exothermic reaction, a 10° rise in temperature will

7. The state of equilibrium refers to

8. Le-Chatelier’s principle is sometime known as

9. For equilibrium 2NO₂(g) ⇌ N₂O₄(g) + 14.6 kcal increase of temperature would

10. A chemical reaction A ⇌ B is said to be in equilibrium when

11. The equilibrium constant in a reversible chemical reaction at a given temperature

12. The product of [0H¯][H⁺] at 25C° is

13. Which of the following is more acidic?

14. Water and ice are in equilibrium at 0C° and pressure is applied at this stage, then

15. Which pH is considered as basic?

16. In a reversible chemical reaction having two reactants in equilibrium, if the concentration of the reactants are doubled then the equilibrium constant will

17. PH of human blood is

18. In reversible reactions, if the forward reaction occur very fast then reactant (s) is (are) __________

19. For the reaction 2A(g) + B(g) ⇌ 3C(g) + D(g) two moles each of A and B were taken into a flask. The following must always be true when the system attained equilibrium

20. At certain temperature, 50% of HI is dissociated into H₂ and I₂ the equilibrium constant is

21. Which of the following gives a basic buffer?

22. The reaction 2SO₂ + 2O₂ ⇌ 2SO will be favoured by

23. Who studied the effect of temperature on equilibrium?

24. Which statements are correct for a reaction at equilibrium?
(I) The forward and reverse reactions both continue
(II) The rates of the forward and reverse reactions are equal
(III) The concentrations of reactants and products are equal

25. If the value of kc is very low then the forward reaction will occur __________

26. In an exothermic reversible reaction increase in temp shifts the equilibrium to

27. Which of the following factors will favour the reverse reaction in a chemical equilibrium?

28. When pressure is applied to the given equilibrium ice water which of the following will happen

29. The rate at which a substance reacts is directly proportional to its active mass and the rate of reaction is directly proportional to the product of the active mass of reacting substances is known as

30. Conjugate base of a very weak acid is

31. Addition of CH3COOH and CH3COONa gives in water

32. In which of the following cases, the reaction goes farthest to completion?

33. In reversible reaction the changes in forward and backward reaction occur _________

34. For a reaction H₂ + I₂ ⇌ 2HI at 721 K, the value of equilibrium constant is 50. If 0.5 moles each of H₂ and I₂ is added to the system the value of equilibrium constant will be

35. If a buffer solution of higher PH than seven is to be made we use

36. The rate of chemical reaction is directly proportional to the active mass of reactant this statement is known as ___________

37. When H₂ and I₂ are mixed and equilibrium is attained, then

38. What can affect the magnitude of equilibrium constant Kp of a reversible gaseous reaction

39. Two moles of HI was heated in a sealed tube at 440°C till the equilibrium was reached. HI was found to be 22% decomposed. The equilibrium constant for dissociation is

40. By the addition of base in water pH will be

41. The factor which changes equilibrium constant o the reaction A₂(g) + B₂(g) → 2 AB(g) is

42. A buffer solution can be prepared by mixing

43. AgCl dissolved with cone (2 x 10¯²) Ksp will be

44. Preparation of buffer solution can be done by mixing

45. What is the relationship between kp and kc?

46. When pressure is applied to the equilibrium system Ice ⇌ Water? Which of the following phenomenon will happen?

47. The relationship between Kp and Kc is give by

48. Reaction which proceed in both the directions is called

49. Which one of the following is a buffer solution?

50. At start of reaction, concentration of reactants are on

51. If rate of concentration of reaction is equal to rate of concentration of products in reversible reaction the __________

52. Units of Kc is

53. When rate of forward reaction is equal to rate of backward reaction, then the equilibrium established is called

54. Idea of PH and POH was put forward by

55. In a chemical reaction N₂ + 3H₂ ⇌ 2NH₃ at equilibrium point

56. Synthesis of ammonia by Habor process is an example of ___________

57. Which of the following aqeous solution will be basic?

58. An equilibrium constant of 10¯⁴ for a reaction means that the reaction is

59. Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution?

60. When ever a week a base is dissolved in water, it gives its conjugate acid similarly a weal acid in water products its conjugate base. The conjugate acid base pair is stated by

61. Solubility of any salt can be determined from

62. pH of milk is

63. A basic Buffer solution can be prepared by mixing